Initial draft for changelog.
diff --git a/CHANGES.txt b/CHANGES.txt
index c3503fc..9eef08d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,55 @@
+2016-05-10 version 3.0.0-beta-3 (C++/Java/Python/Ruby/Nano/Objective-C/C#/JavaScript)
+ General
+ * Supported Proto3 lite-runtime in C++/Java for mobile platforms.
+ * Any type now supports APIs to specify prefixes other than
+ type.googleapis.com
+
+ C++ (Beta)
+ * Improved hash maps. TODO(gpike)
+ * Arenas
+ - Several inlined methods in Arena were moved to out-of-line to improve
+ build performance and code size.
+ - Added SpaceAllocatedAndUsed() to report both space used and allocated
+ - Added convenient class UnsafeArenaAllocatedRepeatedPtrFieldBackInserter
+ * Any
+ - TextFormat now expand the Any type rather than printing bytes.
+ * Performance optimizations and various bug fixes.
+
+ Java (Beta)
+ * Introduced an ExperimentalApi annotation. Annotated APIs are experimental
+ and are subject to change in a backward incompatible way in future releases.
+ * Introduced zero-copy serialization as an ExperimentalApi. TODO(nathanmittler)
+ * Improved the performance for lite-runtime. TODO(dweis)
+ * Various bug fixes and small feature enhancement.
+ - Fixed stack overflow when in hashCode() for infinite recursive oneofs.
+ - Fixed the lazy field parsing in lite to merge rather than overwrite.
+ - TextFormat now supports reporting line/column numbers on errors.
+
+ Python (Beta)
+ * TODO(jieluo)
+
+ Objective-C (Beta)
+ * TODO(thomasvl)
+
+ C# (Beta)
+ * TODO(jonskeet)
+
+ Javascript (Alpha)
+ * TODO(haberman)
+
+ C++/Java Lite (Alpha)
+ A new "lite" generator parameter was introduced in the protoc for C++ and
+ Java to for Proto3 syntax messages. Example usage:
+
+ ./protoc --cpp_out=lite:$OUTPUT_PATH foo.proto
+
+ The protoc will treat the current input and all the transitive dependencies
+ as LITE. The same generator parameter must be used to generate the
+ dependencies.
+
+ In Proto3 syntax files, "optimized_for=LITE_RUNTIME" is no longer supported.
+
+
2015-12-30 version 3.0.0-beta-2 (C++/Java/Python/Ruby/Nano/Objective-C/C#/JavaScript)
General
* Introduced a new language implementation: JavaScript.
